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firearm

(Encyclopedia)firearm, device consisting essentially of a straight tube to propel shot, shell, or bullets by the explosion of gunpowder. Although the Chinese discovered gunpowder as early as the 9th cent., they did...

organic farming

(Encyclopedia)organic farming, the practice of growing plants—especially for fruits and vegetables, but for ornamentals as well—without the use of synthetic pesticides, herbicides, and fertilizers, or of raisin...

African Union

(Encyclopedia)African Union (AU), international organization established in 2002 by the nations of the former Organization of African Unity (OAU). The AU is the successor organization to the OAU, with greater power...

microphone

(Encyclopedia)microphone, device for converting sound into electrical energy, used in radio broadcasting, recording, and sound amplifying systems. Its basic component is a diaphragm that responds to the pressure or...

Thomas, Clarence

(Encyclopedia)Thomas, Clarence, 1948–, associate justice of the U.S. Supreme Court (1991–), b. Pin Point (Savannah), Ga. Raised in a poor family, he graduated (1974) from the Yale Law School and became a promin...

Thurmond, Strom

(Encyclopedia)Thurmond, Strom (James Strom Thurmond) thûrˈmənd [key], 1902–2003, U.S. senator from South Carolina (1954–2003), b. Edgefield, S.C. He read law while teaching school (1923–29) and was admitte...

robotics

(Encyclopedia)robotics, science and technology of general purpose, programmable machine systems. Contrary to the popular fiction image of robots as ambulatory machines of human appearance capable of performing almo...

Cruz, Ted

(Encyclopedia) Cruz, Ted (Raphael Edward), 1970- , American politician, b. Calgary, Alberta, Canada (Princeton Univ. (B.A., 1992), Harvard Law School (J.D., 1995). B...

Kennedy, Anthony McLeod

(Encyclopedia)Kennedy, Anthony McLeod, 1936–, associate justice of the U.S. Supreme Court (1988–2018), b. Sacramento, Calif., grad. Stanford (1958), Harvard Law School (1961). For many years (1965–88) he taug...

solar cell

(Encyclopedia)solar cell, semiconductor devised to convert light to electric current. It is a specially constructed diode, usually made of forms of crystalline silicon or of thin films (as of copper indium gallium ...